The afterglow and kilonova of the short GRB 160821B

E. Troja; A. J. Castro-Tirado; J. Becerra González; Y. Hu; G. S. Ryan; S. B. Cenko; R. Ricci; G. Novara; R. Sánchez-Rámirez; J. A. Acosta-Pulido; K. D. Ackley; M. D. Caballero García; S. S. Eikenberry; S. Guziy; S. Jeong; A. Y. Lien; I. Márquez; S. B. Pandey; I. H. Park; T. Sakamoto; J. C. Tello; I. V. Sokolov; V. V. Sokolov; A. Tiengo; A. F. Valeev; B. B. Zhang; S. Veilleux

doi:10.1093/mnras/stz2255

The afterglow and kilonova of the short GRB 160821B

E. Troja, A. J. Castro-Tirado, J. Becerra González, Y. Hu, G. S. Ryan, S. B. Cenko, R. Ricci, G. Novara, R. Sánchez-Rámirez, J. A. Acosta-Pulido, K. D. Ackley, M. D. Caballero García, S. S. Eikenberry, S. Guziy, S. Jeong, A. Y. Lien, I. Márquez, S. B. Pandey, I. H. Park, T. SakamotoJ. C. Tello, I. V. Sokolov, V. V. Sokolov, A. Tiengo, A. F. Valeev, B. B. Zhang, S. Veilleux

School of Physics and Astronomy

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126 Citations (Scopus)

Abstract

GRB 160821B is a short duration gamma-ray burst (GRB) detected and localized by the Neil Gehrels Swift Observatory in the outskirts of a spiral galaxy at z = 0.1613, at a projected physical offset of 16 kpc from the galaxy's center. We present X-ray, optical/nIR, and radio observations of its counterpart and model them with two distinct components of emission: A standard afterglow, arising from the interaction of the relativistic jet with the surrounding medium, and a kilonova, powered by the radioactive decay of the sub-relativistic ejecta. Broadband modelling of the afterglowdata reveals a weak reverse shock propagating backward into the jet, and a likely jet-break at 3.5 d. This is consistent with a structured jet seen slightly off-axis (θview ∼ θcore) while expanding into a low-density medium (n ≈ 10^-3 cm^-3). Analysis of the kilonova properties suggests a rapid evolution towards red colours, similar toAT2017gfo, and a low-nIR luminosity, possibly due to the presence of a long-lived neutron star. The global properties of the environment, the inferred low mass (Mej ≲ 0.006 Mθ) and velocities (vej ≳ 0.05c) of lanthanide-rich ejecta are consistent with a binary neutron star merger progenitor.

Original language	English
Pages (from-to)	2104-2116
Number of pages	13
Journal	Monthly Notices of the Royal Astronomical Society
Volume	489
Issue number	2
DOIs	https://doi.org/10.1093/mnras/stz2255
Publication status	Published - Oct 2019

Keywords

Gammaray burst: General
Gravitational waves
Nuclear reactions, nucleosynthesis, abundances
Stars: neutron

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10.1093/mnras/stz2255Licence: CC BY

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Troja, E., Castro-Tirado, A. J., Becerra González, J., Hu, Y., Ryan, G. S., Cenko, S. B., Ricci, R., Novara, G., Sánchez-Rámirez, R., Acosta-Pulido, J. A., Ackley, K. D., Caballero García, M. D., Eikenberry, S. S., Guziy, S., Jeong, S., Lien, A. Y., Márquez, I., Pandey, S. B., Park, I. H., ... Veilleux, S. (2019). The afterglow and kilonova of the short GRB 160821B. Monthly Notices of the Royal Astronomical Society, 489(2), 2104-2116. https://doi.org/10.1093/mnras/stz2255

@article{0902ff6c00e24e1087859f0bed1e9606,

title = "The afterglow and kilonova of the short GRB 160821B",

abstract = "GRB 160821B is a short duration gamma-ray burst (GRB) detected and localized by the Neil Gehrels Swift Observatory in the outskirts of a spiral galaxy at z = 0.1613, at a projected physical offset of 16 kpc from the galaxy's center. We present X-ray, optical/nIR, and radio observations of its counterpart and model them with two distinct components of emission: A standard afterglow, arising from the interaction of the relativistic jet with the surrounding medium, and a kilonova, powered by the radioactive decay of the sub-relativistic ejecta. Broadband modelling of the afterglowdata reveals a weak reverse shock propagating backward into the jet, and a likely jet-break at 3.5 d. This is consistent with a structured jet seen slightly off-axis (θview ∼ θcore) while expanding into a low-density medium (n ≈ 10-3 cm-3). Analysis of the kilonova properties suggests a rapid evolution towards red colours, similar toAT2017gfo, and a low-nIR luminosity, possibly due to the presence of a long-lived neutron star. The global properties of the environment, the inferred low mass (Mej ≲ 0.006 Mθ) and velocities (vej ≳ 0.05c) of lanthanide-rich ejecta are consistent with a binary neutron star merger progenitor. ",

keywords = "Gammaray burst: General, Gravitational waves, Nuclear reactions, nucleosynthesis, abundances, Stars: neutron",

author = "E. Troja and Castro-Tirado, {A. J.} and {Becerra Gonz{\'a}lez}, J. and Y. Hu and Ryan, {G. S.} and Cenko, {S. B.} and R. Ricci and G. Novara and R. S{\'a}nchez-R{\'a}mirez and Acosta-Pulido, {J. A.} and Ackley, {K. D.} and {Caballero Garc{\'i}a}, {M. D.} and Eikenberry, {S. S.} and S. Guziy and S. Jeong and Lien, {A. Y.} and I. M{\'a}rquez and Pandey, {S. B.} and Park, {I. H.} and T. Sakamoto and Tello, {J. C.} and Sokolov, {I. V.} and Sokolov, {V. V.} and A. Tiengo and Valeev, {A. F.} and Zhang, {B. B.} and S. Veilleux",

year = "2019",

month = oct,

doi = "10.1093/mnras/stz2255",

language = "English",

volume = "489",

pages = "2104--2116",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

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Troja, E, Castro-Tirado, AJ, Becerra González, J, Hu, Y, Ryan, GS, Cenko, SB, Ricci, R, Novara, G, Sánchez-Rámirez, R, Acosta-Pulido, JA, Ackley, KD, Caballero García, MD, Eikenberry, SS, Guziy, S, Jeong, S, Lien, AY, Márquez, I, Pandey, SB, Park, IH, Sakamoto, T, Tello, JC, Sokolov, IV, Sokolov, VV, Tiengo, A, Valeev, AF, Zhang, BB & Veilleux, S 2019, 'The afterglow and kilonova of the short GRB 160821B', Monthly Notices of the Royal Astronomical Society, vol. 489, no. 2, pp. 2104-2116. https://doi.org/10.1093/mnras/stz2255

TY - JOUR

T1 - The afterglow and kilonova of the short GRB 160821B

AU - Troja, E.

AU - Castro-Tirado, A. J.

AU - Becerra González, J.

AU - Hu, Y.

AU - Ryan, G. S.

AU - Cenko, S. B.

AU - Ricci, R.

AU - Novara, G.

AU - Sánchez-Rámirez, R.

AU - Acosta-Pulido, J. A.

AU - Ackley, K. D.

AU - Caballero García, M. D.

AU - Eikenberry, S. S.

AU - Guziy, S.

AU - Jeong, S.

AU - Lien, A. Y.

AU - Márquez, I.

AU - Pandey, S. B.

AU - Park, I. H.

AU - Sakamoto, T.

AU - Tello, J. C.

AU - Sokolov, I. V.

AU - Sokolov, V. V.

AU - Tiengo, A.

AU - Valeev, A. F.

AU - Zhang, B. B.

AU - Veilleux, S.

PY - 2019/10

Y1 - 2019/10

N2 - GRB 160821B is a short duration gamma-ray burst (GRB) detected and localized by the Neil Gehrels Swift Observatory in the outskirts of a spiral galaxy at z = 0.1613, at a projected physical offset of 16 kpc from the galaxy's center. We present X-ray, optical/nIR, and radio observations of its counterpart and model them with two distinct components of emission: A standard afterglow, arising from the interaction of the relativistic jet with the surrounding medium, and a kilonova, powered by the radioactive decay of the sub-relativistic ejecta. Broadband modelling of the afterglowdata reveals a weak reverse shock propagating backward into the jet, and a likely jet-break at 3.5 d. This is consistent with a structured jet seen slightly off-axis (θview ∼ θcore) while expanding into a low-density medium (n ≈ 10-3 cm-3). Analysis of the kilonova properties suggests a rapid evolution towards red colours, similar toAT2017gfo, and a low-nIR luminosity, possibly due to the presence of a long-lived neutron star. The global properties of the environment, the inferred low mass (Mej ≲ 0.006 Mθ) and velocities (vej ≳ 0.05c) of lanthanide-rich ejecta are consistent with a binary neutron star merger progenitor.

AB - GRB 160821B is a short duration gamma-ray burst (GRB) detected and localized by the Neil Gehrels Swift Observatory in the outskirts of a spiral galaxy at z = 0.1613, at a projected physical offset of 16 kpc from the galaxy's center. We present X-ray, optical/nIR, and radio observations of its counterpart and model them with two distinct components of emission: A standard afterglow, arising from the interaction of the relativistic jet with the surrounding medium, and a kilonova, powered by the radioactive decay of the sub-relativistic ejecta. Broadband modelling of the afterglowdata reveals a weak reverse shock propagating backward into the jet, and a likely jet-break at 3.5 d. This is consistent with a structured jet seen slightly off-axis (θview ∼ θcore) while expanding into a low-density medium (n ≈ 10-3 cm-3). Analysis of the kilonova properties suggests a rapid evolution towards red colours, similar toAT2017gfo, and a low-nIR luminosity, possibly due to the presence of a long-lived neutron star. The global properties of the environment, the inferred low mass (Mej ≲ 0.006 Mθ) and velocities (vej ≳ 0.05c) of lanthanide-rich ejecta are consistent with a binary neutron star merger progenitor.

KW - Gammaray burst: General

KW - Gravitational waves

KW - Nuclear reactions, nucleosynthesis, abundances

KW - Stars: neutron

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U2 - 10.1093/mnras/stz2255

DO - 10.1093/mnras/stz2255

M3 - Article

AN - SCOPUS:85075117114

SN - 0035-8711

VL - 489

SP - 2104

EP - 2116

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

The afterglow and kilonova of the short GRB 160821B

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ARC Centre of Excellence for Gravitational Wave Discovery

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The afterglow and kilonova of the short GRB 160821B

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